Theta Industries, Inc.
Theta Industries has been the industry leader in thermal physical properties measurement and manufacturing of scientific test equipment for over 30 years. We remain dedicated to bringing our customers the finest in both software and hardware to create the most advanced thermal analysis equipment available. We offer a full range of instruments from low cost Dilatometers, laser flash diffusivity to high temperature Viscometers.
|Principle of Electrostatic Levitation|
|In electrostatic containerless materials processing a sample is levitated in a high vacuum by electrostatic forces, melted, and various experiments are performed over a broad temperature range around its melting temperature. Since the sample is isolated from container walls, the purity of sample is preserved. The Electrostatic Levitator can process various materials which include metals, semiconductors and insulators. A number of non-contact diagnostic techniques allow measurements of various thermophysical properties as a function of temperature, such as nucleation mechanism as well as formation of metastable crystalline and amorphous phases with novel properties.|
|4.1||Specimen Positioner: set of two detectors with feedback control, helium-neon laser illumination.|
|5||Heat Source: 1KW xenon arc lamp.|
|A typical temperature versus time profile for a silicon melt undergoing a purely radiative cooling process, such as the recalescence event.|
|Bibliography||bb 6.1||An electrostatic levitator for high temperature containerless materials processing in 1-g|
|bb 6.2||Materials Processing by High Temperature Electrostatic Levitation|
|bb 6.3||A noncontact measurement technique for the specific heat and total hemispherical emissivity of undercooled refractory materials|
|bb 6.4||Constant-Pressure Specific Heat to Hemispherical Total Emissivity Ratio for Undercooled Liquid Nickel, Zirconium, and Silicon|
|bb 6.5||Thermophysical Property Measurement of Molten Silicon by High Temperature Electrostatic Levitation|
|Note:||"bb 6.x" are internal Theta reference numbers. Literature available on request.|